期刊
PEDIATRIC NEPHROLOGY
卷 36, 期 4, 页码 909-916出版社
SPRINGER
DOI: 10.1007/s00467-020-04761-7
关键词
Systemic lupus erythematosus; Biomarkers; Immunology; Lymphocytes; IgM
资金
- Associazione per la Cura del Bambino Nefropatico-Onlus and Ricerca Corrente of the Italian Ministry of Health
The presence of IgM on T cells can effectively distinguish between pediatric patients with SLE and FHN, with T cell IgM positivity showing high sensitivity and specificity for the diagnosis of SLE.
Background Children with systemic lupus erythematosus (SLE) frequently have kidney involvement. Lupus nephritis sometimes presents alone, without systemic SLE features, representing the so-called full-house nephropathy (FHN). Distinguishing patients with SLE or FHN has therapeutic and prognostic implications. Methods In this retrospective observational study, we determined the presence of IgM on the surface of T cells (T cell IgM) by flow cytometry and characterized its ability in distinguishing SLE and FHN patients in a large pediatric cohort (n = 84). Fifty-seven patients with SLE (>= 4 SLICC criteria at disease onset or during the follow-up) and 27 patients with FHN (3 or less SLICC criteria) were enrolled. Results Elevated T cell IgM levels were found in 24/25 SLE patients in active phase of disease and in 29/45 SLE patients in remission. In contrast, among FHN patients, only 1/9 presented this characteristic in active phase of disease and 0/20 in remission. Compared with standardized SLICC laboratory parameters, i.e., autoantibody titers and hypocomplementemia, T cell IgM positivity showed an extremely high sensitivity and specificity for the diagnosis of SLE, with the highest area under the curve (0.97,p < 0.001) by receiver operating characteristic analysis, similar to ANA (0.96,p < 0.001) and anti-dsDNA (0.90,p < 0.001) autoantibodies. Conclusions Altogether, our data indicate that T cell IgM intensity may be a useful tool to correctly classify patients with lupus nephritis as SLE or FHN since disease onset.
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